Did Rihanna and Chris Brown kick off affair again?

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Break up to make up: Rihanna and Chris Brown, who split after he assaulted her, collaborated on a new song remix.

Are Rihanna and Chris Brown not only collaborating — but sneaking around?

The former lovers — who split after he assaulted her in 2009 — recently collaborated on a sexy, suggestive new remix, and rumor has it they’re headed toward a reconciliation. While Chris has a girlfriend, Karrueche Tran, Radar Online reports that he is free to see other people.

“Karrueche isn’t stupid, and she has told friends that they have an open relationship,” a source told the gossip site. “She never asks him about Rihanna, ever.”

“Chris will take several days to call her back at times, and that is OK with Karrueche,” the source adds. “She doesn’t pressure or hound Chris; it’s just not what she is about. She recognizes that they are both young, and she isn’t going to let the fact Chris is spending time with his ex-girlfriend come between what they have.”

Sounds really … mature?

Katy’s Heartbreak

Katy Perry is reportedly heartbroken that Russell Brand has moved on so quickly to other women since their split. Although the ladies’ man professed to have changed his ways during their brief marriage, it didn’t take him long to return to old habits — like a recent incident in which a woman was spotted doing the walk of shame out of his house, Life&Style reports.

“It was about 9:30 in the morning, and I saw them getting into a Range Rover,” an onlooker relayed to the tabloid. “She’d obviously stayed over at his house because she was in evening clothes and high heels. She threw her head back and laughed — it looked like she was having a good time.”

“I’m such a fool,” the “Firework” singer is said to have confided to a friend. “I believed in him.”

“It’s very disturbing to Katy that he’s moved on so quickly,” her pal says. “She was shocked to hear that he was out partying again and trying to pick up girls. It sickens her — she feels humiliated and burned.”

Well, did she not read his book? Russell made it pretty clear what his lady friends would be getting into!

Courteney’s Single Life

Courteney Cox says since splitting with her husband, David Arquette, she hasn’t dated — but her ex is actually encouraging her to start seeing other men.

The parents of daughter Coco are famously buddy-buddy since their split, but are not on a road to reconciliation — in fact, David has moved on to a serious relationship with a new girlfriend.

The former “Friends” star confided to Anderson Cooper on his talk show recently that she hasn’t quite got the hang of dating again, after a 10-year marriage.

“Yeah, you know, it’s hard,” Courteney confided. “I probably caught up to this whole situation later than he did. And, I am really happy for him, and he’s got a girlfriend. Everything’s great. I know it seems so weird — it’s even weird for me to say that.”

When it comes to her love life, “David said, ‘Courteney, you’ve got to get out there.’ I’m easing my way in,” the actress admitted.

While we doubt meeting interested men would be a problem, Courteney frets that she’s a “homebody.”